Add SonarCloud Job Summary to Actions workflow (#62)

* Initial plan

* Add SonarCloud Job Summary step to sonarcloud.yml

Agent-Logs-Url: https://github.com/304NotModified/SLNX-validator/sessions/317ec9e9-0ffd-4326-9b98-20c4631bca49

Co-authored-by: 304NotModified <5808377+304NotModified@users.noreply.github.com>

* Link SonarCloud summary to PR-specific URL when running on a PR

Agent-Logs-Url: https://github.com/304NotModified/SLNX-validator/sessions/ec89ba65-bd0b-4668-962b-fd975edbc6a1

Co-authored-by: 304NotModified <5808377+304NotModified@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: 304NotModified <5808377+304NotModified@users.noreply.github.com>

Author: Copilot

.github/workflows/sonarcloud.yml

@@ -54,3 +54,16 @@ jobs:
         env:
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
         run: dotnet sonarscanner end /d:sonar.token="${SONAR_TOKEN}"
+
+      - name: SonarCloud summary
+        if: always()
+        env:
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          echo "## 🔍 SonarCloud Analysis" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          if [ -n "$PR_NUMBER" ]; then
+            echo "View full results: [sonarcloud.io/summary/new_code?id=slnx-validator&pullRequest=${PR_NUMBER}](https://sonarcloud.io/summary/new_code?id=slnx-validator&pullRequest=${PR_NUMBER})" >> $GITHUB_STEP_SUMMARY
+          else
+            echo "View full results: [sonarcloud.io/project/overview?id=slnx-validator](https://sonarcloud.io/project/overview?id=slnx-validator)" >> $GITHUB_STEP_SUMMARY
+          fi